ARM: dts: Add camera subsystem device nodes to exynos4.dtsi

This patch adds common Exynos4 SoC series FIMC and MIPI CSIS
device nodes.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>